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        <h3 id="数学公式"><a href="#数学公式" class="headerlink" title="数学公式"></a>数学公式</h3><p><span class="exturl" data-url="aHR0cHM6Ly93d3cuY25ibG9ncy5jb20vd2FuZ3hpbjM3L3AvODE4NTY4OC5odG1s">https://www.cnblogs.com/wangxin37/p/8185688.html<i class="fa fa-external-link-alt"></i></span></p>
<h4 id="单行公式"><a href="#单行公式" class="headerlink" title="单行公式"></a>单行公式</h4><p>$RMSE = 1 - \dfrac{\sum_{i=1}^n (y_i - \hat{y}_i)^2} {\sum_{i=1}^n (y_i - \bar{y})^2}$</p>
<span id="more"></span>
<h4 id="行内公式"><a href="#行内公式" class="headerlink" title="行内公式"></a>行内公式</h4><p>当 $ a \ne 0 $ 时, 对于这个方程 $(ax^2 + bx + c = 0)$ 有两个答案，分别是：</p>
<script type="math/tex; mode=display">x = {-b \pm \sqrt{b^2-4ac} \over 2a}.</script><h4 id="大括号右多行赋值"><a href="#大括号右多行赋值" class="headerlink" title="大括号右多行赋值"></a>大括号右多行赋值</h4><script type="math/tex; mode=display">
f(n) =
\begin{cases}
n/2,  & \text{if $n$ is even} \\
3n+1, & \text{if $n$ is odd}
\end{cases}</script><h4 id="矩阵"><a href="#矩阵" class="headerlink" title="矩阵"></a>矩阵</h4><script type="math/tex; mode=display">\begin{bmatrix}
{a_{11}}&{a_{12}}&{\cdots}&{a_{1n}}\\
{a_{21}}&{a_{22}}&{\cdots}&{a_{2n}}\\
{\vdots}&{\vdots}&{\ddots}&{\vdots}\\
{a_{m1}}&{a_{m2}}&{\cdots}&{a_{mn}}\\
\end{bmatrix}</script><h4 id="多行公式对齐，标号-begin-split"><a href="#多行公式对齐，标号-begin-split" class="headerlink" title="多行公式对齐，标号 \begin{split}"></a>多行公式对齐，标号 \begin{split}</h4><script type="math/tex; mode=display">
\begin{equation}
\begin{split}
\frac{\partial^2 f}{\partial{x^2}} &= \frac{\partial(\Delta_x f(i,j))}{\partial x} = \frac{\partial(f(i+1,j)-f(i,j))}{\partial x} \\
&= \frac{\partial f(i+1,j)}{\partial x} - \frac{\partial f(i,j)}{\partial x} \\
&= f(i+2,j) -2f(f+1,j) + f(i,j)
\end{split}
\end{equation}</script><h4 id="这个不编号，加个-nonumber"><a href="#这个不编号，加个-nonumber" class="headerlink" title="这个不编号，加个 \nonumber"></a>这个不编号，加个 \nonumber</h4><script type="math/tex; mode=display">
\begin{eqnarray}
\beta^*(D) = \mathop{argmin} \limits_{\beta} \lambda {||\beta||}^2 + \sum_{i=1}^n max(0, 1 - y_i f_{\beta}(x_i))
\nonumber
\end{eqnarray}</script><h4 id="公式自动编号-开头标号-begin-equation-或-begin-eqnarray"><a href="#公式自动编号-开头标号-begin-equation-或-begin-eqnarray" class="headerlink" title="公式自动编号,开头标号 \begin{equation} 或 \begin{eqnarray}"></a>公式自动编号,开头标号 \begin{equation} 或 \begin{eqnarray}</h4><script type="math/tex; mode=display">
\begin{eqnarray}
\sum_{i=0}^n F_i \cdot \phi (H, p_i) - \sum_{i=1}^n a_i \cdot ( \tilde{x_i}, \tilde{y_i}) + b_i \cdot ( \tilde{x_i}^2 , \tilde{y_i}^2 )
\end{eqnarray}</script><script type="math/tex; mode=display">
\begin{eqnarray}
\beta^*(D) = \mathop{argmin} \limits_{\beta} \lambda {||\beta||}^2 + \sum_{i=1}^n max(0, 1 - y_i f_{\beta}(x_i))
\end{eqnarray}</script><h4 id="公式手动编号"><a href="#公式手动编号" class="headerlink" title="公式手动编号"></a>公式手动编号</h4><script type="math/tex; mode=display">
\begin{equation}
\sum_{i=0}^n F_i \cdot \phi (H, p_i) - \sum_{i=1}^n a_i \cdot ( \tilde{x_i}, \tilde{y_i}) + b_i \cdot ( \tilde{x_i}^2 , \tilde{y_i}^2 ) \tag{1.2.3}
\end{equation}</script><h3 id="程序块"><a href="#程序块" class="headerlink" title="程序块"></a>程序块</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">HelloWorld</span> </span>&#123;</span><br><span class="line">	<span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span></span>&#123;</span><br><span class="line">		System.out.println(<span class="string">&quot;Hello,World&quot;</span>);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h3 id="表格"><a href="#表格" class="headerlink" title="表格"></a>表格</h3><div class="table-container">
<table>
<thead>
<tr>
<th>name</th>
<th style="text-align:center">111</th>
<th style="text-align:center">222</th>
<th style="text-align:center">333</th>
<th style="text-align:right">444</th>
</tr>
</thead>
<tbody>
<tr>
<td>aaa</td>
<td style="text-align:center">bbb</td>
<td style="text-align:center">ccc</td>
<td style="text-align:center">ddd</td>
<td style="text-align:right">eee</td>
</tr>
<tr>
<td>fff</td>
<td style="text-align:center">ggg</td>
<td style="text-align:center">hhh</td>
<td style="text-align:center">iii</td>
<td style="text-align:right">000</td>
</tr>
</tbody>
</table>
</div>
<h3 id="支持的-HTML-元素"><a href="#支持的-HTML-元素" class="headerlink" title="支持的 HTML 元素"></a>支持的 HTML 元素</h3><p>使用 <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>Del</kbd> 重启电脑</p>
<h3 id="图片"><a href="#图片" class="headerlink" title="图片"></a>图片</h3><div style="float:none;clear:both;">
下文其他内容
</div>

<div style="float:left;border:solid 1px 888888;margin:2px;"><img src="https://gitee.com/atan2021/pic/raw/master/20210905_GPS.jpg" alt='GPS模块' width="200"/></div>

<div style="float:left;border:solid 1px 888888;margin:2px;"><img src="https://gitee.com/atan2021/pic/raw/master/20210905_GPStianxian.jpg" alt='GPS天线'  height="296"/></div>

<div style="float:none;clear:both;">
下文其他内容
</div>

<table>
    <tr>
        <td ><center><img src="https://gitee.com/atan2021/pic/raw/master/20210905_GPS.jpg" >图1  新垣结衣1 </center></td>
        <td ><center><img src="https://gitee.com/atan2021/pic/raw/master/20210905_GPStianxian.jpg"  >图2 新垣结衣1</center></td>
    </tr>

    <tr>
        <td><center><img src="https://gitee.com/atan2021/pic/raw/master/20210905_GPStianxian.jpg"  >图3 新垣结衣2</center></td>
        <td ><center><img src="https://gitee.com/atan2021/pic/raw/master/20210905_GPS.jpg"  >图4 新垣结衣2</center> </td>
    </tr>
</table>

<h3 id="行内代码"><a href="#行内代码" class="headerlink" title="行内代码"></a>行内代码</h3><p>用反引号<br>这里 <code>printf</code> 可以</p>
<h3 id="raw"><a href="#raw" class="headerlink" title="raw"></a>raw</h3>
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</style>

<p>Tabs</p>
<p>Click on the buttons inside the tabbed menu:</p>

<div class="tab">
  <button class="tablinks" onclick="openCity(event, 'London')">London</button>
  <button class="tablinks" onclick="openCity(event, 'Paris')">Paris</button>
  <button class="tablinks" onclick="openCity(event, 'Tokyo')">Tokyo</button>
  <button class="tablinks" onclick="openCity(event, 'Tokyo2')">Tokyo2</button>
</div>

<div id="London" class="tabcontent">
  <p>London</p>
  <p>London is the capital city of England.</p>
</div>

<div id="Paris" class="tabcontent">
  <h3>Paris</h3>
  <p>Paris is the capital of France.</p> 
</div>

<div id="Tokyo" class="tabcontent">
  <p>Tokyo</p>
  <p>123</p>
</div>

<div id="Tokyo2" class="tabcontent">
  <p>Tokyo2</p>
</div>

<script>
function openCity(evt, cityName) {
  var i, tabcontent, tablinks;
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  evt.currentTarget.className += " active";
}
</script>


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        <div style="text-align:center;color: #ccc;font-size:14px;">------ 本文结束------</div>
    
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